NEW YORK — New York Lt. Gov. Brian Benjamin says he has tested positive for COVID-19 just days after attending the state Democratic convention. The former Harlem state senator, who was appointed by Gov. Kathy Hochul after she replaced Gov. Andrew Cuomo, says he is fully vaccinated and boosted and is experiencing only mild symptoms. “Cat and our girls’ tests came back negative—praise God!” Benjamin said in a Sunday night tweet. “I’ll be isolating at home as they monitor for symptoms and get tested again in a few days.” The announcement came after Benjamin joined Hochul, Hillary Clinton and a ra…